I've had some issues but nothing major (2010 N54), since I got the car 3 months ago.
My spark plugs were all-black because my injectors (index 07) were leaking. Nothing major, but the previous owner never replaced the plugs (30k miles).
Got new plugs, had a faulty low pressure fuel sensor that I changed as well. Ordered new index 12 injectors, replaced them and the engine runs smooth as a baby face.
My chargepipe (OEM) blew off (car is stock, except for a Magnaflow cat-back), so I replaced it for a cp-E chargepipe.
After that I had errors regarding wheel speed sensors and o2 sensors (pre-cat, bank 1), replaced them all last week just to be on the safe side.
Now I'll try to find out which HPFP I have, if it's made by Bosch I'll probably get the newer one ready to be replaced.
It's a fantastic car and if you have a scanner, proper tools, knowledge of the commom N54 issues and can DIY most of things it's a no-brainer.
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